拖动鼠标实现放缩
代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    *{
        padding: 0;
        margin: 0;
    }
    #big{
        width: 300px;
        height: 300px;
        background-color: aqua;
        position: relative;
       left: 200px;
    }
    #small{
        width: 50px;
        height: 50px;
        background-color: rgb(100, 107, 107);
        position:absolute;
        bottom:0;
        right:0;
    }
    #small:hover{
        cursor: nw-resize;
    }
</style>
<body>
    <div id="big">
        <div id="small">

        </div>
    </div>
</body>
<script>
    let smallDom=document.getElementById('small')
    let bigDom=document.getElementById('big')
    smallDom.onmousedown=function(event){
        let xDiff=event.offsetX;
        let yDiff=event.offsetY;
        let right=smallDom.clientWidth-xDiff;
        let bottom=smallDom.clientHeight-yDiff;
        document.onmousemove=function(event)
        {
            bigDom.style.width=event.clientX+right-bigDom.offsetLeft+'px';
            bigDom.style.height=event.clientY+bottom-bigDom.offsetTop+'px';
        }
    }
    document.onmouseup=function(){
        document.onmousemove=null;//当鼠标离开时div大小不在改变
    }
</script>
</html>
各个值的表示：

在这里插入图片描述
效果展示：

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